Study On Preparation And Properties Of High Properties UHMWPE Composites

With the development of science and technology，material science isdeveloping in the direction of characterizing high performance，functionality and composite.High Polymer based composites areespecially in favour with the Public for its excellent comprehensiveperformance and wide application area. It develops therefore rapidly.Thedesigns of composite material using inorganic filling compounds toreinforce Ultra high molecular weight polyethylene(UHMWPE) and animprovement on heat-resistant of polymer working as tribologicalmaterial were selected as the major research subjeet in this thesis.Fillers were treated by coupling agent and the UHMWPEcomposites mechanical properties were studied，which showed thatcoupling agent could improve UHMWPE performance; silane andmacromolecule couplings could modify the interfacial adherence of thefillers and UHMWPE and that composites dealt by compound couplingshave more optimized the mechanical and heat-resistant than by singlecoupling agent．Secondly, nano-SiC powder coated by nano-SiO2was prepared in achemical precipitation method, and analysed with TEM and FTIR.Dispersion of coated particles in the UHMWPE matrix was studied.Theheat-resistant, anti-carrying and wear properties of UHMWPE compositesfilled by nano-coated SiC were investigated. The results showed that:modified method of coating is played a good role in promoting dispersionof silicon carbide in the matrix. UHMWPE composites filled by thenano-coated powders obtain good interfacial binding and had optimizedproperties for heat-resistant, anti-carrying and wear.Some properties of UHMWPE ofen only were improved bysingle filler, but other properties may be below standard, or even declined.For this reason, orthogonal experiment is taken to analyze the UHMWPEcomposites which were co-filled by coated-SiC/nano-Si3N4/MoS2/silicone. Experimental results show that the co-filling had obvioussynergetic effect and that composites had optimized properties forheat-resistant, anti-carrying and wear. Wear SEM proved the existence of synergetic effect.